Improvement in pitmen and mode of attachment to band



L. N. HOUSE. I improvement in Pi tman and mode of Attachment to Band Wheels.

9m [Iii Patented Feb. 6,1872.

LEONARD N. .RO'USE, OF OOVINGTON, KENTUCKY.

IMPROVEMENT IN PITMEN AND MODE 0F ATTACHMENT T0 BAND-WHEELS.

Specification forming part of Letters Patent No. 123,363, dated February 6, 1872.

I, LEONARD N. RoUsE, of Covington, Kenton county, State of Kentucky, have invented a certain new and useful Improvement in Pitmen an d Band-W'heel for Sewing'l/Iachines, of which the following is a specification:

Nature and Objects of the Invention.

My invention consists, first, in connection with band-wheel, constructed torotate upon a fixed stud or spindle, of a pitman so peculiarly formed that, although its wrist on the band-wheel is connected at a point where the strain upon it is almost directly over the center of the wheelbearing, it is made to clear the hub of the wheel in motion; the object being to avoid the canting strain incident heretofore to band-wheels revolving upon fixed studs; second, in a certain peculiar device by which the wear of the pitman-wrist in .the band-wheel can be taken up at any time; third, in a peculiar construction of the lower end of the pitinan, by which the wear in its connection with the treadle can be taken up readily with the greatest precision.

' Description of the Accompanying Drawing.

Figure l is an elevation, partly in section, of a sewing-machine frame, band-wheel, treadle, and pitman embodying my invention. Fig. 2 is a detached view of the lower end of the pitman.

General Description.

A represents the table of asewing-machinc B, the side of the frame; and (J, the treadle. The band-wheel l) is of the customary form, except in its connection with the pitman. It is journaled upon the fixed stud 15, which is secured to the frame B in the ordinary way.

By long experience in the manufacture and use of sewing-machines I have discovered that it is important that the band-wheel hub should have a long journal-bearing on the fixed stud E that the groove (Z should be over the center of this hearing; and that the pitman should be connected at a point on the band-wheel near the center line of the bearing, in order to avoid unequal wear and shackoperation.

To accomplish this I construct the band wheel D with a hub, d, of considerable length, as shown, and so disposed that the groove d is midway between the ends of the hub. A short taper-journal is also provided in the arms of the band-wheel, into which the wrist F of the pitman G fits.

In order to connect the wrist of the pitman with this short journal in the arm of the bandwheel, and still provide for a direct connection with the treadle and a clearance for the long hub of the bandwhee], I form a gap, 1, in the pit-man G, the gap being of sutficient dimensions to allow of the passage of the pitman over or across the hub d and end of stud E.

\Vith this construction and connection of pitman and bandwheel the strain of the pitman is sustained by the band-wheel at a point nearly in the same plane as the center of the hub-bearing, and there is, therefore, no tendency on the part of the wheel to cant on the bcarin g or shackle in motion.

The wrist F is formed with a collar, f, which, in connection with the screw f, serves to secure it to the pitman G, and is tapering in form in the portion that fits the band-wheel. A nut, f, is fitted to the wrist, as shown, and also a number of washers. f. The provision of the washers admits of the wear of this wrist being taken up at any time by simply changing their location; as, for instance, when the wrist has worn itself loose, if one of the washers is removed from the collar side, and placed on the side of the nut f, the wrist will be forced further into the taper-journal, and thus made to fit.

The lower end of the pitman is split, as shown, across its journal-bearing a, and lifted with an adjusting-screw, H, so that this journal may be reduced in size when worn, and made to fit the journal-stud on the treadle.

Claims.

1. In the described combination with the band-wheel D, constructed with a long hub, d, (projecting from the line of groove 61 on each side,) to revolve loosely upon the fixed stud E, I claim the gap-pitinanG 1, connected and operating substantially as and for the purpose described.

2. In connection with the taper wrist-bearwith an adjusting-screw, H, as and for the ing in the band-Wheel, the tapeuwrist F, when purpose specified. constructed with coll-a1 f, and fitted with In testimony of which invention Ihereunto nut f and Washers f, as and for the purpose set my hand. described. Witnesses: LEONARD IN. HOUSE.

3. The pitman Gr, when formed with a split FRANK MILLWARD, end across the journal-bearing a, and fitted J. L. \VARTMANN. 

